* {
    margin: 0;
    padding: 0;
    list-style: none;
  }
  
  body {
    /* background-color: #f8fafb; */
  }
  
  .header {
    border-bottom: 1px solid #ccc;
    margin-left: 35px;
    background-color: #fff;
    margin-right: 25px;
  }
  
  .header > ul {
    display: flex;
  }
  
  .header .header-title {
    padding: 10px;
    position: relative;
  }
  
  .header .header-title:nth-child(1) {
    margin-left: -10px;
  }
  
  .header .header-title.active::after {
    position: absolute;
    content: "";
    top: 100%;
    left: 0;
    background-color: #2e7eee;
    width: 100%;
    height: 1px;
    border: none;
    transform: translateY(-50%);
  }
  
  .container {
    width: 100%;
    /* margin: 0 auto; */
    background-color: #fff;
    margin-top: 20px;
  }
  
  .tree {
    padding: 15px 10px;
    background-color: #fff;
    margin-right: 25px;
  }
  
  .tree-node-content {
    padding: 5px 0;
  }
  
  .tree-node-content:hover {
    background-color: #f6f6f6;
  }
  
  .tree-node-content .tree-node-content-left .point-svg {
    opacity: 0;
    cursor: pointer;
    margin-right: 5px;
  }
  
  .tree-node-content:hover .tree-node-content-left .point-svg {
    opacity: 1;
  }
  
  .tree-node-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  
  .tree-node-content .config-svg {
    margin: 0 15px;
    width: 20px;
    height: 20px;
    cursor: pointer;
  }
  
  .tree-node-content .tree-node-content-left {
    display: flex;
    align-items: center;
  }
  
  .tree-node-content .tree-node-content-right {
    display: flex;
    align-items: center;
    color: #a4a4a4;
    font-size: 12px;
  }
  
  .tree-node-content .tree-node-content-right .students-count {
  }
  
  .tree-node-content .tree-node-content-right .config {
    display: flex;
    align-items: center;
  }
  
  .tree-node-content .tree-node-content-right .config .doc-link {
    cursor: pointer;
    outline: none;
    color: #999;
    width: 98px;
    height: 35px;
    line-height: 35px;
    font-size: 16px;
    line-height: 35px;
    text-align: center;
    border: 1px solid #999;
    border-radius: 4px;
    background-color: transparent;
    margin-right: 5px;
  }
  
  .tree-node-content .tree-node-content-right .config .doc-link:hover {
    color: #fff;
    background: #2e7eee;
    border: 1px solid #2e7eee;
  }
  
  .tree-node-content .tree-node-tag {
    font-size: 14px;
    color: #a4a4a4;
    margin-right: 10px;
  }
  
  .tree-node-content .tree-node-label {
    font-size: 18px;
  }
  
  .hide {
    display: none;
  }
  
  .mouseover-active {
    background-color: #f2f2f2;
    border-bottom: 2px solid #2e7eee;
  }
  